Malkov, E.; Bekov, A.; Momynov, S.; Beckmuhamedov, I.; Kurmangaliyev, D.; Mukametzhan, A.; Orynqul, I. INVESTIGATION OF TWO FIXED CENTERS PROBLEM AND HENON-HEILES POTENTIAL BASED ON THE POINCARE SECTION. СФМН 2020, 55-61.